The bad-ass gravity pump was created by Professor Farnsworth and Bubblegum Tate. At its end, there is a basketball, and it took an unknown amount of time to build (implied to be months or years), cost all of the money on Earth, and is used to move stars (3ACV14).

It was attached to the Planet Express ship, which used it for moving certain stars to contain the release of chronitons and repair the flow of time, ending the time skips plaguing the universe.

Tate: Yeah. But is it possible? Moving stars would require one bad-ass gravity pump. And we'd need all the money on Earth to-[Time skips and Tate and Farnsworth find themselves in the Oval Office. Tate holds a "bad-ass gravity pump proposal".]Tate: What the-Farnsworth: Wha?[They pick up a cheque for "all of Earth's money" that has been signed by Nixon's head.]Nixon: Here's the funding for your gravity pump. But it damn well better work! We can't spend all of Earth's money every day. Now, how long will it take to build?Tate: It won't be easy, Nixon. A jim-jam this complex might take months or even–[Time skips and Tate and Farnsworth are in a large warehouse.]Farnsworth: Ah, there we are. One gravity pump. [The gravity pump is huge and has a basketball on the end.] Powerful enough to move the stars themselves. Now to begin the arduous task of attaching it to the ship so th–[Time skips. Farnsworth is in the Planet Express hangar watching the ship take off with the gravity pump attached to the roof.]Farnsworth: [Waving.] Off you go, apparently.